condition mean min max ZT0-3 114.5 114.5 114.5 ZT4-7 150.7 150.7 150.7 ZT8-11 171.55 171.55 171.55 ZT12-15 162.1 162.1 162.1 ZT16-19 145.95 145.95 145.95 ZT20-23 149.25 149.25 149.25